Lifting device for disassembling and reassembling pump parts

ABSTRACT

A split casing pump is provided with a bracket which pivotally supports a lifting bar. The casing half which is desired to be removed is attached to a hanger which rolls on the lift bar. After the casing half is released from the stationary portion of the pump, it is swung out of the way on the bar so that the wearing parts of the pump can be replaced. For reassembly, the removed casing half is rotated back to its original position; and because the hanger can be rolled on the lift bar, it can be eased into proper bolting position.

United States Patent Zilkalns 1 July 25,1972

[54] LIFTING DEVICE FOR DISASSEMBLING AND REASSEMBLING PUMP PARTS [72] Inventor: Jurls Zilkllns, Lachine, Quebec, Canada [73] Assignee: Allis-Chalmers Manufacturing Company,

Milwaukee, Wis.

[22] Filed: Oct. 2, 1970 21 Appl. No.: 71,413

....29/200 D, 29/200 J, 29/200 P $21 11.5. 01... [5| I Int. Cl

{58] Field of Search ..29/200 D, 200 1,200 P, 200 R [56] References Cited UNITED STATES PATENTS Miller ..29/200 J Primary Examiner-Thomas H. Eager Anorney-John P. Hines, Robert B. Benson and Charles L. Schwab [57] ABSTRACT A split casing pump is provided with a bracket which pivotally supports a lifting bar. The casing half which is desired to be removed is attached to a hanger which rolls on the lift bar.

After the casing half is released from the stationary portion of the pump, it is swung out of the way on the bar so that the wearing parts of the pump can be replaced. For reassembly. the removed casing half is rotated back to its original position; and because the hanger can be rolled! on the lift bar, it can be eased into proper bolting position.

3 Claim, 2 Drawing figures LIFTING DEVICE FOR DISASSEMBLING AND REASSEMBLING PUMP PARTS This invention pertains in general to a lifting device attached to a split casing pump for supporting the heavy pump parts during disassembly and reassembly of the pump.

When pumps such as centrifugal pumps are used as sand pumps or acid pumps, they are provided with liner members to prevent excessive wear on or damage to the casing interior. These liners require periodic inspection and replacement or repair. The impeller also receives considerable wear requiring inspection and occasional replacement. Each time the interior of the pump requires inspection or repair, the pump casing must be opened to provide access to its interior. Since many of these pumps are quite large, the casing part which must be removed is considerably heavy, and a portable crane or some other form of lifting device is required.

In one known prior art structure, a socket is cast in the stationary pump casing part and a bar is pivotally received in the socket. The free end of the bar is connected to the removable pump part so it can be swung out of the way. However, in the prior art structure, the removable pump part cannot be moved along the bar to inch it into bolting position during reassembly.

It is the intention and general object of this invention to provide an improved lifting device for direct attachment to one part of a split casing pump which device includes a swing bar and a hanger supported on said bar for longitudinal movement relative thereto, said hanger supporting removable pump parts during disassembly and reassembly of the pump.

An additional object of the subject invention is to provide a pump lifting device of the hereinbefore described type which is removably attached to the pump casing so that it can be removed and utilized on different pumps.

These and other objects of the subject invention will become more fully apparent as the following description is read in light of the attached drawing wherein:

FIG. 1 is a partial perspective view showing the rear portion of a pump lifting device combination constructed in accordance with the subject invention; and

FIG. 2 is a perspective view showing the front portion of the pump lifting device shown in FIG. 1.

Referring to the attached drawing, the pump lifting device of this invention is shown in connection with a vertically split casing centrifugal pump generally designated 6. The pump is provided with a removable casing half or part 7 and a stationary casing half or part 8. These two casing halves are releasably connected together in any conventional manner, such as by bolts 9 passing through clamping lugs 11 and I2 provided on each casing half 7 and 8, respectively.

A support bracket generally designated 13 is releasably connected to the stationary casing half 8. This connection may be made in any conventional manner and is herein shown as being provided by three cap screws 14 turned into tapped holes (not shown) in the stationary casing half 8. The bracket 13 is provided with a socket 16. An L-shaped swing bar 17 is pivotally received in the socket 16 to permit swinging movement of the bar free end adjacent to or away from the removable casing half7.

A hanger generally designated 18 is connected to the bar 17 to permit relative movement of the hanger along the length of the bar. As herein shown for purposes of illustration. the hanger 18 is constructed of a U-shaped member 19 and a clamp 24. The U-shaped member is provided with a roller 21 rotatably connected between the free ends thereof. The roller 21 is provided with a concave surface which is complementary to the surface of the lift bar 17. Stop pins 22 and 23 are provided in that portion of the lift bar 17 on which the hanger 18 rolls to limit the extent of movement of the hanger along the bar.

As herein shown for purposes of illustration, the connection between the U-shaped member 19 and clamp 24 is made with an elongated threaded stud 26. One end of the stud is passed through an opening provided in the lower portion of the U sha ed member 19. Nuts 27 are provided on each side of the U-s aped member 19 to adjusta ly attach the stud thereto.

The stud 26 is adjustably connected to the clamp 24 by means of nuts 28. The free ends of the clamp 24 are provided with openings therethrough which align with openings provided on the removable pump casing part 7.

When it is desired to remove the removable pump casing part 7, the bar 17 is swung over the pump in the position shown in the drawing. The hanger 181 is slipped over the front pin 22 with the roller 21 resting on the bar 17. The clamp 24 is then attached to the removable pump casing part 7 after the proper adjustment is made with the stud and nuts The pump casing part 7 is then released from the stationary pump casing part Sand swung out of the way so that the interior portion of the pump can be repaired or replaced.

To replace the pump casing part 7, it is swung back into position and eased into proper alignment with the stationary pump casing part 8 by rolling the hanger 18 on the lift bar 17.

With this device, a very simplified and accurate means is provided to remove and replace a portion of a split casing pump. Because of the pivotal movement of the lift bar 17 and the rolling movement of the hanger 18, very accurate alignment of the two casing parts can be effected.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A lifting device for disassembling and reassembling parts for a pump having removable casing parts comprising: A support arm having one end pivotally supported by one of said pump casing parts for swinging movement relative thereto, the other end of said arm being swingabl e between positions adjacent to and away from the other pump parts, said arm having a horizontally disposed portion; hanger means supported on said horizontally disposed portion of :said arm for movement along the longitudinal axis thereof, said hanger including vertically adjustable means adapted for releasable connection to said other pump parts to support same during disassembly and reassembly of the pumps.

2. The lifting device set forth in claim 1 wherein said support arm is pivotally supported by a bracket releasably connected to said one pump casing part.

3. The lifting device set forth in claim I wherein said hanger is provided with a roller which rolls on said support arm and further comprising a pair of stop means on said support arm limiting the extent of rolling movement of said hanger. 

1. A lifting device for disassembling and reassembling parts for a pump having removable casing parts comprising: A support arm having one end pivotally supported by one of said pump casing parts for swinging movement relative thereto, the other end of said arm being swingable between positions adjacent to and away from the other pump parts, said arm having a horizontally disposed portion; hanger means supported on said horizontally disposed portion of said arm for movement along the longitudinal axis thereof, said hanger including vertically adjustable means adapted for releasable connection to said other pump parts to support same during disassembly and reassembly of the pumps.
 2. The lifting device set forth in claim 1 wherein said support arm is pivotally supported by a bracket releasably connected to said one pump casing part.
 3. The lifting device set forth in claim 1 wherein said hanger is provided with a roller which rolls on said support arm and further comprising a pair of stop means on said support arm limiting the extent of rolling movement of said hanger. 